Output of C programm.

Question

#include<stdio.h>
#include<math.h>

int main(){
    int M_PI=25;
    printf("%d",M_PI);
    return 0;
}

• A. Run Time Error
• B. Compile Time Error
• C. 25
• D. Gargabe value

Comments

If math.h file is included it will give error as M_PI is constant defined in math.h whereas if we declare M_PI without math.h header file , this works fine.

U can refer :

http://www.c4learn.com/c-programming/c-variable-nameing-rules/

Consider the "tip 9" of this link.

Answer 1

Ans 2

It is a typical tricky question from C.

• Constant M_PI is already defined in math.h to store value of pi.
• In main () we are declaring a constant with same name M_PI

So compiler throws an error

• If math.h is not included, the code will print 25

Comments

@shiva can you explain ? why

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Why compiler time error.. Can u plse explain?

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Explanation is added. I Hope it is useful :)

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Thanks:)

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Reason:http://www.gnu.org/software/libc/manual/html_node/Mathematical-Constants.html